[Android Pro] 超能RecyclerView组件使用

RecyclerView最强大的功能在于秒变功能，只需要改动很少的代码就可以实现ListView，GridView及水平ListViw的切换功能

public class MainActivity extends ActionBarActivity {
    private RecyclerView mRecyclerView;
    private List mDatas;
    private TestAdapter mAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initDatas();
        initViews();
    }
 
    private void initDatas() {
        mDatas=new ArrayList();
        TestData data=new TestData();
        for (int i = 'A'; i < 'z'; i++) {
            data.setTitle(Title+(char)i);
            data.setContent(Content+(char)i);
            mDatas.add(data);
        }
    }
 
    private void initViews() {
        mRecyclerView=(RecyclerView) findViewById(R.id.test_rcv);
        mAdapter=new TestAdapter(this, mDatas);
        mRecyclerView.setAdapter(mAdapter);
 
/************水平ListView效果****************************************/
        LinearLayoutManager ll=new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, true);
        mRecyclerView.setLayoutManager(ll);
 
/************垂直ListView效果****************************************/
        LinearLayoutManager ll=new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, true);//实现ListView效果
        mRecyclerView.setLayoutManager(ll);
 
/************水平滚动的GridView效果****************************************/
 
        StaggeredGridLayoutManager ll=new StaggeredGridLayoutManager(5, StaggeredGridLayoutManager.HORIZONTAL);//水平GridView效果，5列展示
        mRecyclerView.setLayoutManager(ll);
 
/************GridView效果****************************************/
        GridLayoutManager ll=new GridLayoutManager(this, 4);//4列展示
        mRecyclerView.setLayoutManager(ll);
    }
}

下面就是实现瀑布流操作，主要改的就是我们的适配器，要在适配器中动态计算item的高度

public class WaterFlowAdapter extends Adapter {
    private Context mContext;
    private List mDatas;
    private List heightArray;
 
    public WaterFlowAdapter(Context mContext, List mDatas) {
        this.mContext = mContext;
        this.mDatas = mDatas;
        heightArray=new ArrayList();
        for (int i = 0; i < mDatas.size(); i++) {
            heightArray.add((int)(100+Math.random()*300));
        }
    }
 
    @Override
    public WaterFlowAdapter.TestViewHolder onCreateViewHolder(ViewGroup paramViewGroup, int paramInt) {
        View v = LayoutInflater.from(mContext).inflate(R.layout.lv_item, null);   wrong
 
       View v = LayoutInflater.from(mContext).inflate(R.layout.lv_item,paramViewGroup,false);   right
        TestViewHolder holder = new WaterFlowAdapter.TestViewHolder(v);
        return holder;
    }
 
    @Override
    public void onBindViewHolder(WaterFlowAdapter.TestViewHolder paramVH, int paramInt) {
        LayoutParams lp=paramVH.itemView.getLayoutParams();
        lp.height=heightArray.get(paramInt);
        paramVH.itemView.setLayoutParams(lp);
        paramVH.titleTv.setText(mDatas.get(paramInt).getTitle());
        paramVH.contentTv.setText(mDatas.get(paramInt).getContent());
    }
 
    @Override
    public int getItemCount() {
// TODO Auto-generated method stub
        return mDatas.size();
    }
 
    class TestViewHolder extends ViewHolder {
        ImageView iconIv;
        TextView titleTv;
        TextView contentTv;
 
        public TestViewHolder(View holder) {
            super(holder);
            iconIv = (ImageView) holder.findViewById(R.id.item_iv);
            titleTv = (TextView) holder.findViewById(R.id.item_title);
            contentTv = (TextView) holder.findViewById(R.id.item_content);
        }
 
    }
}

最后在Activity中：

mAdapter=new WaterFlowAdapter(this, mDatas);
mRecyclerView.setAdapter(mAdapter);
 
StaggeredGridLayoutManager ll=new StaggeredGridLayoutManager(4, StaggeredGridLayoutManager.VERTICAL);//水平GridView效果，5列展示
mRecyclerView.setLayoutManager(ll);